RUSSIAN MINER'S AIR FLOW ANEMOMETER by F. & O. MULLER
06-021. Russian, early 2nd quarter 20th century, signed in Cyrillic " F. & O. MULLER" on the face. Made of polished lacquered brass, 6 3/4" long overall, with 2 1/4" diameter recording dial face, 2 7/8" diameter wire cage to protect the 4-vane anemometer, and mounting screw on the bottom. This attractive air flow anemometer is in fine overall condition, with its original calibration paper; the original fitted metal case is in very good overall condition.
